<?php

/**
 * @file
 * User page callbacks for the search module.
 */

/**
 * Menu callback; presents the search form and/or search results.
 *
 * @param $module
 *   Search module to use for the search.
 * @param $keys
 *   Keywords to use for the search.
 */
function search_view($module = NULL, $keys = '') {
	$info = FALSE;
	$redirect = FALSE;
	$keys = trim($keys);
	// Also try to pull search keywords out of the $_REQUEST variable to
	// support old GET format of searches for existing links.
	if (!$keys && !empty($_REQUEST['keys'])) {
		$keys = trim($_REQUEST['keys']);
	}

	if (!empty($module)) {
		$active_module_info = search_get_info();
		if (isset($active_module_info[$module])) {
			$info = $active_module_info[$module];
		}
	}

	if (empty($info)) {
		// No path or invalid path: find the default module. Note that if there
		// are no enabled search modules, this function should never be called,
		// since hook_menu() would not have defined any search paths.
		$info = search_get_default_module_info();
		// Redirect from bare /search or an invalid path to the default search path.
		$path = 'search/' . $info['path'];
		if ($keys) {
			$path .= '/' . $keys;
		}
		drupal_goto($path);
	}

	// Default results output is an empty string.
	$results = array('#markup' => '');
	// Process the search form. Note that if there is $_POST data,
	// search_form_submit() will cause a redirect to search/[module path]/[keys],
	// which will get us back to this page callback. In other words, the search
	// form submits with POST but redirects to GET. This way we can keep
	// the search query URL clean as a whistle.
	if (empty($_POST['form_id']) || $_POST['form_id'] != 'search_form') {
		$conditions =  NULL;
		if (isset($info['conditions_callback']) && function_exists($info['conditions_callback'])) {
			// Build an optional array of more search conditions.
			$conditions = call_user_func($info['conditions_callback'], $keys);
		}
		// Only search if there are keywords or non-empty conditions.
		if ($keys || !empty($conditions)) {
			// Log the search keys.
			watchdog('search', 'Searched %type for %keys.', array('%keys' => $keys, '%type' => $info['title']), WATCHDOG_NOTICE, l(t('results'), 'search/' . $info['path'] . '/' . $keys));

			// Collect the search results.
			$results = search_data($keys, $info['module'], $conditions);
		}
	}
	// The form may be altered based on whether the search was run.
	$build['search_form'] = drupal_get_form('search_form', NULL, $keys, $info['module']);
	$build['search_results'] = $results;

	return $build;
}

/**
 * Process variables for search-results.tpl.php.
 *
 * The $variables array contains the following arguments:
 * - $results: Search results array.
 * - $module: Module the search results came from (module implementing
 *   hook_search_info()).
 *
 * @see search-results.tpl.php
 */
function template_preprocess_search_results(&$variables) {
	$variables['search_results'] = '';
	if (!empty($variables['module'])) {
		$variables['module'] = check_plain($variables['module']);
	}
	foreach ($variables['results'] as $result) {
		$variables['search_results'] .= theme('search_result', array('result' => $result, 'module' => $variables['module']));
	}
	$variables['pager'] = theme('pager', array('tags' => NULL));
	$variables['theme_hook_suggestions'][] = 'search_results__' . $variables['module'];
}

/**
 * Process variables for search-result.tpl.php.
 *
 * The $variables array contains the following arguments:
 * - $result
 * - $module
 *
 * @see search-result.tpl.php
 */
function template_preprocess_search_result(&$variables) {
	global $language;

	$result = $variables['result'];
	$variables['url'] = check_url($result['link']);
	$variables['title'] = check_plain($result['title']);
	if (isset($result['language']) && $result['language'] != $language->language && $result['language'] != LANGUAGE_NONE) {
		$variables['title_attributes_array']['xml:lang'] = $result['language'];
		$variables['content_attributes_array']['xml:lang'] = $result['language'];
	}

	$info = array();
	if (!empty($result['module'])) {
		$info['module'] = check_plain($result['module']);
	}
	if (!empty($result['user'])) {
		$info['user'] = $result['user'];
	}
	if (!empty($result['date'])) {
		$info['date'] = format_date($result['date'], 'short');
	}
	if (isset($result['extra']) && is_array($result['extra'])) {
		$info = array_merge($info, $result['extra']);
	}
	// Check for existence. User search does not include snippets.
	$variables['snippet'] = isset($result['snippet']) ? $result['snippet'] : '';
	// Provide separated and grouped meta information..
	$variables['info_split'] = $info;
	$variables['info'] = implode(' - ', $info);
	$variables['theme_hook_suggestions'][] = 'search_result__' . $variables['module'];
}

/**
 * As the search form collates keys from other modules hooked in via
 * hook_form_alter, the validation takes place in _submit.
 * search_form_validate() is used solely to set the 'processed_keys' form
 * value for the basic search form.
 */
function search_form_validate($form, &$form_state) {
	form_set_value($form['basic']['processed_keys'], trim($form_state['values']['keys']), $form_state);
}

/**
 * Process a search form submission.
 */
function search_form_submit($form, &$form_state) {
	$keys = $form_state['values']['processed_keys'];
	if ($keys == '') {
		form_set_error('keys', t('Please enter some keywords.'));
		// Fall through to the form redirect.
	}

	$form_state['redirect'] = $form_state['action'] . '/' . $keys;
	return;
}
